The lawsuit, which is expected to be filed Friday morning, accuses Kansas City, Kan., Leawood, Lenexa and Prairie Village of overstepping their authority by banning the right to openly carry a gun in most parts of their city.

The Libertarians accuse the cities of wrapping a ban on openly carrying guns into local ordinances on concealed weapons.

"There are two separate laws between open and concealed carry," said Earl McIntosh, the Second Amendment chairman of the Kansas Libertarian Party.

He said state law allows open carry in many public areas, except for government buildings.

"We're not asking anybody to open carry. We're not asking anybody to carry a gun. All we're asking is for cities, municipalities and counties to follow the state law," he said.

Overland Park, Gardner and Wichita all changed their gun laws because of the same issue and were not named in the lawsuit.

The Libertarian group said the four cities in the lawsuit are being taken to court because they didn't acknowledge the group's claim.

The lawsuit asks for an immediate injunction to stop the cities from enforcing current laws against openly carrying guns.

The Obama administration will unveil a major climate change plan Monday aimed at a large reduction in greenhouse gas emissions from the nation's coal-burning power plants, a senior administration official told CNN.